How to obtain a simple and effective rendering without having to create a complex material?
I found a solution which consists in using the rendering engine of the viewport 3D to render the scene with the light parameters of it. There is no need to change the way of modeling the 3D model.

It's even possible to apply ambient occlusion effects to this one, so maybe use textures, but I haven't checked yet. The only thing that changes is that when rendering the model, you will have to go to the properties window, render section, and choose the &quot;Workbench&quot; rendering engine. From there, you can configure, according to your needs, the different options available, ranging from the choice of lighting to color management.



Then once done, you can press F12 or go to the menu bar, render menu, to render the scene as you would have done with the other renderers.


After the rendering is finished, you simply save the previously created rendering image on your computer.
<img src="https://i.stack.imgur.com/MMAEi.jpg" alt="
Save the rendering to the computer for use on the web or otherwise" />
And also, it is preferable to use this technique rather than that of materials override, because, as its name suggests, this one aims to replace all the materials present in the 3D scene. So exit your materials with custom normal map textures or ambient occlusion. For those who do not have what is the materials override, please read this post: 2.8 - Is it possible to assign (override) a material to a whole collection ?